Birds are vertebrates that have wings, legs, beaks, and feathers. They lay hard eggs. Most birds can fly, but some birds such as penguins and ostriches can’t. Birds of prey, […]

The moon orbits the Earth once every 27.3 days. It does not emit its own light but reflects the light of the sun. Because it orbits around the Earth, the […]

A quadrilateral is a polygon with 4 sides. A rectangle has 4 right angles. A square has 4 right angles and 4 congruent sides. A parallelogram has 2 pairs of […]

1. Egg: A female frog lays eggs in a pond. The eggs hatch into tadpoles. 2. Tadpole: The tadpole eats algae and grows bigger. Then it grows its hind legs […]

You can find the perimeter of a figure by adding the lengths of the sides. For example, if your carpet is 4 meters long and 3 meters wide, its perimeter […]

The area of a figure is represented by how many square units are inside the figure. If a square unit is 1 centimeter long on each side, its area is […]

If the number you are rounding is 5 or greater, round up.If the number you are rounding is 4 or less, round down. Let’s round these numbers to the nearest […]

cube: a three-dimensional shape with six equal square sides cone: a three-dimensional shape that has a round flat base, sloping sides, and a pointed top pyramid: a three-dimensional shape that […]

All matter can be classified into three states: solid, liquid, and gas. Solid: A solid has a definite shape and volume. Liquid: A liquid has a definite volume but takes […]

There are 206 bones in the human body. They make up the skeleton, which supports and retains the body. It also protects the brain and internal organs. Some bones are […]